@article{7740f35257d14607b6813d31d8411a4f,
title = "Transverse acoustic impedance measurements for surface states of superfluid 3He A 1 and A 2 phases",
abstract = "We measured the complex transverse acoustic impedance in both superfluid 3He A 1 and A 2 phases. This impedance is sensitive to surface states. In our preliminary results, the temperature dependence of the impedance in the A 1 phase is similar to that in A phase, and the imaginary part shows an anomaly in the A 2 phase. These anomalies occurred at the temperature defined as T k, which is lower as the frequency gets higher. The similar frequency dependence of T k in each phase suggests that the anomaly is attributed to the same origin. The frequency dependence of the T k /T c indicates that the shape of the surface density of each spin pair state did not greatly change in the present experimental temperature range.",
keywords = "Acoustic impedance, Superfluid He, Surface state",
author = "Satoshi Murakawa and Akira Yamaguchi and Miho Arai and Masahiro Wasai and Yuki Aoki and Hidehiko Ishimoto and Ryuji Nomura and Yuichi Okuda",
note = "Funding Information: Acknowledgements We would like to thank K. Nagai, Y. Nagato, S. Higashitani for useful discussions. This study was supported in part by the Global Center of Excellence Program at Tokyo Tech., “Nanoscience and Quantum Physics Project”, a Grant-in-Aid for Scientific Research (C) (No. 19540361) and on Priority Areas (No. 20029009) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. This work was carried out under the Visiting Researcher{\textquoteright}s Program of the Institute for Solid State Physics, the University of Tokyo.",
year = "2010",
month = jan,
doi = "10.1007/s10909-009-0008-7",
language = "English",
volume = "158",
pages = "141--146",
journal = "Journal of Low Temperature Physics",
issn = "0022-2291",
publisher = "Springer New York",
number = "1-2",
}